Summary: The previous review was mine after I discovered that Trendnet's own driver had very poor performance. Joe Fisher from their technical support contacted me after the review and mentioned that they were actively working on a fix. However, he pointed me to the Ralink driver that would work (http://www.mediatek.com/en/downloads/usb/), and now I see the 5 Ghz band at 121 mbs download speed (up from 36 mbs).
Pros: Technical Support team actively looks for issues with customers and finds a solution.
Summary: I have an Asus RT-N66U router, which I bridged with my Xfinity 105 Extreme service. The router is one floor up and about 35 away with a staircase, floor, and two walls between it and the TEW 684U adapter. My wired speeds max out at 122 mbs.
Pros: I compared this adapter to two other adapters and it has better transfer rate than either of the other two.
Cons: Ralink and Trendnet teamed up to create a driver that will allow the 5 Ghz band to be seen in Win 8.1 Update. They succeed in creating the driver; however, the performance of the Ralink driver (both 2.4 and 5 Ghz bands) is dismal and if you use the driver you will see 2/3 of your possible download speed disappear (versus the use of the native Windows 8.1 driver).
Summary: Best USB adapter we have tried. I like that it doesn't have to stick out of the USB port and it is fast and reliable as advertised. We use Trendnet products exclusively for all thing wireless.
Summary: This little item is super, my Internal Network card in my NEW Desktop could not see the 5ghz band from 12 feet and two Sheetrock walls. I purchase this on a chance and it sees the band with no problem, is simple to program and add security etc. I have 5 bars and have been able to use the 5ghz with no problems at all and I have also used the 2.4ghz. This works without flaws with my Dual Band TP-Link Modem Router and now I am a Happy Camper.
Summary: Got this to connect to a dual-band router on the 5GHz band so I can stream from my HDHomeRun tuner. It installed and connected easily, and transfer rates are high enough to display the HD signal. I didn't give it 5 stars because the speed doesn't seem to stay consistent, but it does typically stay high enough for my use.
Summary: When I first bought it, it connected at 450mbps, and I have only seen it in the 300's once. Other than that always 450mbps. But the problem is the ping. When I play world of tanks, my ping is 999ms, and it can go down to the 800's. I have a medialink adapter which says it has speeds up to 150mbps, but the highest it has ever connected is 72mbps, but it has pings in the 20-40ms range.
Summary: Good range for 5ghz and gives pretty solid speeds across single story home. Speed fluctuates from 240-450, but too many factors in wireless tech to assign blame. Actual downloading and transferring across network is fine.
Summary: I bought this for my son's computer which is in a room away from our router. His computer did not have wireless capability installed, so this fixed the problem perfectly. It's small and works exactly as it should. Well worth the price.